-- Copyright © 1993 by  McGraw-Hill, Inc. and Zainalabedin Navabi

-- FIGURE 7.8 




-- ENTITY DECLERATION OF 3-to-8 MILTIPLEXER :

USE WORK.basic_utilities.ALL;
ENTITY dcd_3_to_8 IS
  PORT (adr : IN qit_vector (2 DOWNTO 0); so : OUT qit_vector (7 DOWNTO 0));
END dcd_3_to_8;
--



-- THE DATAFLOW DESCRIPTION FOR3-to-8 MILTIPLEXER :

ARCHITECTURE dataflow OF dcd_3_to_8 IS
BEGIN
  WITH adr SELECT
    so <= "00000001" AFTER 2 NS WHEN "000",
          "00000010" AFTER 2 NS WHEN "001" | "00Z",
          "00000100" AFTER 2 NS WHEN "010" | "0Z0",
          "00001000" AFTER 2 NS WHEN "011" | "0ZZ",
          "00010000" AFTER 2 NS WHEN "100" | "Z00",
          "00100000" AFTER 2 NS WHEN "101" | "Z0Z",
          "01000000" AFTER 2 NS WHEN "110" | "ZZ0",
          "10000000" AFTER 2 NS WHEN "111" | "ZZZ",
          "XXXXXXXX" WHEN OTHERS;
END dataflow;